18.85
18.84....
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The circumference of a circle if its radius is 3 is about 18.85
The radius is 3.
circumference= pi(3.14) by the diameter. if your given the radius, double the radius and times by pi.
The radius of a circle with a circumference of 110 is: 17.507
The circumference of a circle with a radius of 6.7 is: 42.097